The owners of this UFO have been chasing the asteroid for many lightyears waiting for it to crash into something so they can retrieve a special mineral from it for thei weapons systems.
It crashed in a forest where two friends were hiking. The alien saw them as a threat and attacked.

Aliens, don't they bug you? Always zappin' people. Where are those nice aliens? Ones with cake. And good cake, not cake like Little Debbie makes. If you ask me that Little Debbie is an alien. Hmmm. I need some cake. Thanks for remindin' me. I'll have to go shopping on the way home from work. Speaking of work, good work on that moc, although it seems to need some cake. garth